Geologic Conditions and Main Controlling Factors of Gas Washing in Kongqueting Region in Xihu Depression,Eastern Sea Basin

SU Ao，CHEN Hong-han，MA Yu-hua，ZHAN Hai-yong，YANG Wen-shuai

doi:10.11764/j.issn.1672-1926.2015.02.0292

2015 , Vol. 26 >Issue 2: 292 - 300

DOI: https://doi.org/10.11764/j.issn.1672-1926.2015.02.0292

Geologic Conditions and Main Controlling Factors of Gas Washing in Kongqueting Region in Xihu Depression,Eastern Sea Basin

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1.Geophysical Research Institute,BGP,CNPC,Zhuozhou 072750,China;
2.Key Lab of “Tectonics and Petroleum Resource” of Educational Ministry,China University of Geosciences,Wuhan 430074,China;
3.Xinjiang Oilfield Company Shixi Oilfield Operations Area,CNPC,Karamay,834000,China;
4.Huan Qiu Project Management(Beijing) Co.,Ltd.3,CNPC,Beijing 100027,China

Received date: 2014-04-01

Revised date: 2014-06-13

Online published: 2015-02-10

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Abstract

There was extensive evaporative fractionation effect in Xihu Depression,Eastern Sea Basin.However,most of the previous study on the gas washing is qualitative description.Taking Kongqueting region in Pinghu structural belt as an example,based on the geochemical characteristics and fracture characteristic,this paper discussed geologic conditions and main controlling factors of gas washing and analyzed effect of hydrocarbon reservoir by fluid inclusion system analysis technology and n-alkanes testing method.These findings suggest that coal measures which can generate gas continuously have abundant organic matter and provide good source rocks.Numerous faults and good match between oil and gas filling time result in the occurrence of gas washing in the Kongqueting region.Quantitative calculation of gas washing fractionation effect show that n-alkane loss rate of crude oil in the wells in the study area is 35.3% to 97.1% and break number is 18 to 27.Source distance and vertical depth control strength of gas washing fractionation effect.Besides,the former is more powerful controlling function than the latter.Gas washing fractionation effect not only makes gas layers and ratio of condensate gas layers decrease along the direction of the gas invasion,but also leads to the pattern of oil reservoir above gas reservoir and formation of condensate with low wax content and condensate gas with high wax content.

Key words： Gas washing; Geologic conditions; Controlling factors; Xihu Depression; Kongqueting region

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SU Ao，CHEN Hong-han，MA Yu-hua，ZHAN Hai-yong，YANG Wen-shuai . Geologic Conditions and Main Controlling Factors of Gas Washing in Kongqueting Region in Xihu Depression,Eastern Sea Basin[J]. Natural Gas Geoscience, 2015 , 26(2) : 292 -300 . DOI: 10.11764/j.issn.1672-1926.2015.02.0292

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